- log.go: log level system (DEBUG, INFO, WARN, ERROR, NONE)
- CLI: -log-level flag (default info), -verbose as shorthand for debug
- Watcher: logs sync/remove actions at INFO level
- Watcher: logs events at DEBUG level
- Errors: structured error messages (DISK FULL, PERMISSION DENIED, etc.)
- Updated README with -log-level flag

- Log start of sync with source directory
- Print progress every 1000 files during sync
- Log completion with stats (files, dirs, skipped, errors) and elapsed time
- Print 'watcher: ready' when monitoring begins
- Exit cleanly on dry-run

- Replaced go-gitignore with custom GitignoreStack that tracks
  multiple .gitignore files hierarchically
- Patterns are processed in root-to-leaf order, last match wins
- Negation patterns in child dirs override parent ignores
- Patterns only apply within their directory scope (no leaking)
- Added 6 new tests for nested .gitignore:
  - Scoped: patterns only affect own directory
  - Dir-scoped: different dirs can ignore different things
  - Negation override: child !pattern un-ignores parent's *.pattern
  - Deep nesting: 3+ levels of .gitignore
  - Parent scope doesn't leak to siblings
- All 35 tests passing

- Added watcher_test.go: 10 tests covering create, write, remove,
  rename, ignored files, debouncing, directory creation/removal,
  and manifest updates
- Refactored watch() to accept context.Context for clean cancellation
- Added signal handling (SIGINT/SIGTERM) for graceful shutdown in main.go
- Fixed test expectations (version two = 11 bytes, not 10)

- main.go: CLI entry point with flag parsing
- gitignore.go: .gitignore loading and parsing
- sync.go: initial sync with manifest tracking
- watcher.go: fsnotify-based file watcher with debouncing
- Dockerfile: multi-stage build for Alpine runtime